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This totally misses the mark on what a notebook is. It is just for producing pretty looking documents, but it doesn't provide a way to work interactively (as an alternative to the command line)
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SzabolcsJun 10 '14 at 0:32

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@TylerRinker I did arrive here by searching for IPython for R. The project you link to is not an alternative to IPython, despite the claims of its author (who seems to be confused about what a notebook interface is). "rNotebook" appears to be focused on embedding R code (and its result) in a document, i.e. creating a report/presentation. It is not about working interactively, which is the main purpose of notebook interfaces, including both Mathematica (the system pioneering the notebook interface), and IPython (whose notebook is inspired by Mathematica).
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SzabolcsJun 10 '14 at 3:45

It also looks like a report generation tool, focused on creating pretty documents. It's not a notebook in the sense how Mathematica, IPython, or even MATLAB's Cell mode works. IPython now has some support for R, which is the only proper R notebook that I have seen.
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SzabolcsJan 7 at 0:36

Not sure it would be an exact equivalent of iPython's notebooks, but you can use knitr to make literacy programming in R, by inserting code chunks inside a document. If you use a format like RMarkdown, you can export the document and the result of the code chunks to HTML. You can then publish the HTML file somewhere, or use sites like Rpubs. This process is quite straightforward if you use the RStudio IDE.

Another way, if you are an Emacs user, is to use org-mode and its extension org-babel.

Finally, you should be able to create more dynamic things with a framework like shiny. See for example the following knitr demo from the shiny library :